Gastrointestinal Surgery — MCQs

Gastrointestinal Surgery Indian Medical PG Practice Questions and MCQs

Question 31: A 23-year-old female presents with a movable and painless abdominal lump. Exploratory laparotomy reveals a cystic lump arising from the mesentery, characterized by the absence of lymphatic supply but an independent blood supply. What is the probable diagnosis?

A. Chylolymphatic mesenteric cyst (Correct Answer)
B. Enterogenous mesenteric cyst
C. Ectopic pregnancy
D. Pelvic abscess

Explanation: **Explanation:** The clinical presentation and intraoperative findings are classic for a **Chylolymphatic Mesenteric Cyst**, which is the most common variety of mesenteric cyst. 1. **Why Option A is correct:** * **Pathology:** Chylolymphatic cysts arise from sequestered lymphatic tissue that fails to communicate with the main lymphatic system. * **Blood Supply:** Because they develop in the mesentery, they possess an **independent blood supply** from the adjacent bowel. This allows for surgical enucleation without compromising the viability of the intestine. * **Lymphatics:** The characteristic **absence of a lymphatic supply** (despite containing chyle/lymph) is a hallmark feature mentioned in standard surgical texts (like Bailey & Love). * **Clinical Presentation:** They typically present as a painless, "movable" lump. A key sign is mobility in the plane perpendicular to the attachment of the mesentery (Tillaux’s sign). 2. **Why other options are incorrect:** * **Enterogenous Mesenteric Cyst (B):** These are duplication cysts derived from the bowel wall. Unlike chylolymphatic cysts, they share a **common blood supply** with the adjacent bowel, often requiring bowel resection during surgery. * **Ectopic Pregnancy (C):** This would present with acute pelvic pain, amenorrhea, and hemodynamic instability, not a painless, movable mesenteric lump. * **Pelvic Abscess (D):** This presents with systemic signs of infection (fever, leucocytosis) and localized tenderness, rather than a mobile, painless cyst. **NEET-PG High-Yield Pearls:** * **Tillaux’s Sign:** A mesenteric cyst is mobile only in a direction perpendicular to the root of the mesentery (from left to right). * **Treatment of Choice:** Enucleation is preferred for Chylolymphatic cysts; Bowel resection is often necessary for Enterogenous cysts. * **Most common site:** The mesentery of the ileum.

Question 32: Which of the following is NOT a predisposing factor for esophageal cancer?

A. Diverticula
B. Human papilloma virus
C. Mediastinal fibrosis (Correct Answer)
D. Caustic ingestion

Explanation: **Explanation:** The correct answer is **Mediastinal fibrosis**. While mediastinal fibrosis (often caused by histoplasmosis or sarcoidosis) can cause extrinsic compression of the esophagus leading to dysphagia, it does not involve the mucosal changes or chronic irritation necessary to predispose a patient to malignancy. **Analysis of Options:** * **Diverticula (Option A):** Specifically, **Zenker’s diverticulum** is associated with a 0.3–1.5% risk of squamous cell carcinoma (SCC). Stasis of food within the pouch leads to chronic inflammation and mucosal irritation, which can trigger malignant transformation. * **Human Papilloma Virus (Option B):** High-risk strains (HPV 16 and 18) are implicated in the pathogenesis of **Squamous Cell Carcinoma** of the esophagus, similar to their role in cervical and oropharyngeal cancers. * **Caustic Ingestion (Option D):** Accidental or suicidal ingestion of lye (alkali) causes severe esophageal strictures. These patients have a **1000-fold increased risk** of developing SCC, typically occurring 20–40 years after the initial insult. **High-Yield NEET-PG Pearls:** * **Most common type worldwide:** Squamous Cell Carcinoma (SCC). * **Most common type in the West/increasing incidence:** Adenocarcinoma (associated with GERD and Barrett’s Esophagus). * **Plummer-Vinson Syndrome:** Triad of iron deficiency anemia, glossitis, and esophageal webs; a major risk factor for SCC in the post-cricoid region. * **Tylosis (Palmoplantar Keratoderma):** An autosomal dominant condition with a nearly 100% lifetime risk of esophageal SCC. * **Achalasia Cardia:** Chronic stasis leads to a 15–30 fold increased risk of SCC.

Question 33: Which statement regarding duodenal ulcers is true?

A. They are never malignant. (Correct Answer)
B. The most common site is the second part of the duodenum.
C. They are common in individuals with blood group AB.
D. Gastrointestinal bleeding is not seen in duodenal ulcers.

Explanation: **Explanation:** **1. Why Option A is Correct:** Duodenal ulcers (DU) are almost exclusively benign. Unlike gastric ulcers, which carry a 3–5% risk of malignancy and require mandatory biopsy, **duodenal ulcers are never malignant.** If a malignant lesion is found in the duodenum, it is typically a primary duodenal adenocarcinoma or a periampullary carcinoma, rather than a "malignant transformation" of a peptic ulcer. Therefore, routine biopsy of a duodenal ulcer is not indicated. **2. Why the Other Options are Incorrect:** * **Option B:** The most common site for duodenal ulcers is the **first part of the duodenum** (specifically the duodenal bulb/cap), within 2 cm of the pylorus. This area is most exposed to acidic gastric chyme. * **Option C:** Duodenal ulcers are classically associated with **Blood Group O**. In contrast, gastric cancer is more common in individuals with Blood Group A. * **Option D:** Gastrointestinal bleeding is actually the **most common complication** of duodenal ulcers. Bleeding typically occurs from the erosion of the **gastroduodenal artery**, which lies posterior to the first part of the duodenum. **3. High-Yield Clinical Pearls for NEET-PG:** * **Etiology:** The most common cause is *H. pylori* infection (90-95%), followed by NSAID use. * **Pain Pattern:** DU pain typically occurs 2–3 hours after meals (hunger pain) and is **relieved by food** (unlike gastric ulcers, where pain is aggravated by food). * **Perforation:** Usually occurs in the **anterior wall** of the first part of the duodenum. * **Acid Secretion:** DU is associated with hypersecretion of gastric acid (increased parietal cell mass), whereas gastric ulcers often have normal or low acid levels.

Question 34: Which of the following statements about small bowel carcinoids is true?

A. The most common site is the duodenum.
B. They do not cause endocardial fibroelastosis.
C. There is an increased risk of lung cancer.
D. None of the above. (Correct Answer)

Explanation: Small bowel carcinoids are neuroendocrine tumors (NETs) derived from enterochromaffin (Kulchitsky) cells. This question tests your knowledge of their anatomical distribution, systemic complications, and associated risks. ### **Why "None of the above" is correct:** * **Option A is incorrect:** The most common site for small bowel carcinoids is the **ileum** (specifically the terminal ileum), not the duodenum. In the entire GI tract, the most common sites are the rectum, ileum, and appendix. * **Option B is incorrect:** Carcinoid heart disease is a classic manifestation of Carcinoid Syndrome (usually occurring after liver metastasis). It is characterized by **endocardial fibroelastosis**, primarily affecting the right-sided valves (tricuspid and pulmonary), leading to plaque-like thickening and valvular dysfunction. * **Option C is incorrect:** While carcinoids are associated with other malignancies, there is no specific, primary increased risk of lung cancer linked to small bowel carcinoids. However, patients with carcinoid tumors have a significantly higher incidence (up to 25%) of **synchronous or metachronous secondary gastrointestinal malignancies** (like adenocarcinoma). ### **High-Yield Clinical Pearls for NEET-PG:** * **Rule of 1/3rds:** 1/3rd are multiple, 1/3rd are in the distal ileum, 1/3rd have a second malignancy, and 1/3rd have already metastasized at presentation. * **Carcinoid Syndrome:** Occurs only when mediators (Serotonin, Bradykinin) bypass hepatic metabolism (e.g., liver metastasis or primary bronchial/ovarian carcinoids). * **Diagnosis:** Best initial screening test is **24-hour urinary 5-HIAA**. The most sensitive imaging for localization is **Octreoscan** (Somatostatin receptor scintigraphy) or **68Ga-DOTATATE PET/CT**. * **Pathology:** Characterized by "salt and pepper" chromatin and positive staining for **Chromogranin A** and **Synaptophysin**.

Question 35: Capsule endoscopy is used for which of the following conditions?

A. Gastroesophageal reflux disease (GERD)
B. Motility disorder
C. Gastrointestinal bleeding (Correct Answer)
D. None of the above

Explanation: **Explanation:** **Capsule Endoscopy (CE)** is a non-invasive diagnostic tool primarily used to visualize the **small intestine**, an area often referred to as the "black box" of the GI tract because it is difficult to reach via conventional upper endoscopy or colonoscopy. **Why Gastrointestinal Bleeding is Correct:** The primary indication for capsule endoscopy is **Obscure Gastrointestinal Bleeding (OGIB)**. When a patient presents with persistent GI bleeding (melena or hematochezia) but has negative findings on both gastroscopy and colonoscopy, the source is likely in the small bowel (e.g., angiodysplasia, Crohn’s disease, or small bowel tumors). CE allows for high-resolution mucosal imaging of the entire jejunum and ileum to identify these lesions. **Why Other Options are Incorrect:** * **GERD (Option A):** GERD is primarily a clinical diagnosis or evaluated via **Upper GI Endoscopy** (to check for esophagitis/Barrett’s) and **24-hour pH monitoring** (the gold standard). Capsule endoscopy is not the standard of care here. * **Motility Disorders (Option B):** While a capsule can track transit time, motility disorders are best diagnosed using **Manometry** (esophageal or anorectal) or **Gastric emptying studies** (scintigraphy). In fact, severe motility disorders are a relative contraindication for CE due to the risk of capsule retention. **High-Yield Clinical Pearls for NEET-PG:** * **Most common indication:** Obscure GI Bleeding. * **Most common complication:** **Capsule Retention** (especially in patients with known strictures or Crohn’s disease). * **Contraindications:** Intestinal obstruction, strictures, and pregnancy. * **Patency Capsule:** A dissolvable capsule used prior to the actual procedure if a stricture is suspected to ensure the device will pass safely.

Question 36: Which of the following is true about mesenteric cysts?

A. Enterogenous cyst is the commonest type.
B. Recurrence is common after enucleation.
C. Mesenteric cysts are usually multiple.
D. Enucleation is the treatment of choice for chylolymphatic cysts. (Correct Answer)

Explanation: ### Explanation **Mesenteric cysts** are rare intra-abdominal tumors located between the leaves of the mesentery, most commonly in the small bowel mesentery (ileum). **1. Why Option D is Correct:** The treatment of choice for mesenteric cysts is **enucleation**. Since chylolymphatic cysts (the most common variety) have an independent blood supply, they can usually be "peeled off" or enucleated from the surrounding mesenteric vessels without compromising the blood supply to the adjacent bowel. This preserves the intestine and prevents the need for resection. **2. Analysis of Incorrect Options:** * **Option A:** The **chylolymphatic cyst** is the most common histological type, not the enterogenous cyst. Enterogenous cysts are thicker-walled and often share a common blood supply with the bowel. * **Option B:** Recurrence is **rare** after complete enucleation. Recurrence is typically only seen if the cyst is merely aspirated or partially drained (marsupialization). * **Option C:** Mesenteric cysts are **usually solitary**. While multiple cysts can occur (especially in lymphangiomatosis), the classic presentation is a single, unilocular or multilocular cyst. **3. High-Yield Clinical Pearls for NEET-PG:** * **Tillaux’s Sign:** A pathognomonic clinical finding where the cyst is mobile in a plane perpendicular to the axis of the mesentery (moves side-to-side) but has restricted mobility along the axis of the mesentery. * **Most Common Site:** Small bowel mesentery (specifically the ileum). * **Clinical Presentation:** Most are asymptomatic but can present with chronic abdominal pain or acutely due to torsion, rupture, or hemorrhage. * **Surgical Note:** If enucleation is impossible due to shared blood supply (common in enterogenous cysts), **bowel resection with end-to-end anastomosis** is required.

Question 37: A 28-year-old man presents with pain in the umbilical region that has migrated to the right iliac fossa. Which of the following signs is corroborative of acute appendicitis?

A. Referred pain in the right side with pressure on the left (Rovsing's sign) (Correct Answer)
B. Increase of pain with testicular elevation (occurs in epididymitis)
C. Relief of pain in the lower abdomen with extension of the thigh (psoas sign may be positive)
D. Relief of pain in the lower abdomen with internal rotation of the right thigh (obturator sign may be positive)

Explanation: **Explanation:** The clinical presentation of periumbilical pain migrating to the Right Iliac Fossa (RIF) is the classic "Murphy’s sequence," highly suggestive of **Acute Appendicitis**. **1. Why Option A is Correct:** **Rovsing’s Sign** is a classic physical exam finding where palpation or pressure applied to the Left Iliac Fossa (LIF) causes referred pain in the RIF. This occurs because the pressure displaces intraluminal gas and peritoneal contents toward the cecum, irritating the inflamed parietal peritoneum in the RIF. It is a specific indicator of localized peritoneal irritation. **2. Why the Other Options are Incorrect:** * **Option B:** Pain relief with testicular elevation is known as **Prehn’s sign**, which helps differentiate epididymitis (pain relieved) from testicular torsion (pain persists). It is unrelated to appendicitis. * **Option C:** The **Psoas Sign** involves an *increase* (not relief) of pain with passive extension of the right hip or active flexion against resistance. It suggests an inflamed appendix in a **retrocecal** position. * **Option D:** The **Obturator Sign** involves an *increase* (not relief) of pain with passive internal rotation of the flexed right thigh. It suggests an inflamed appendix in a **pelvic** position, irritating the obturator internus muscle. **Clinical Pearls for NEET-PG:** * **Most common position of the appendix:** Retrocecal (74%). * **Alvarado Score (MANTRELS):** A score of $\geq 7$ is highly predictive of appendicitis. * **Sherren’s Triangle:** Formed by the umbilicus, ASIS, and pubic symphysis; hyperesthesia here indicates obstructive appendicitis. * **Gold Standard Investigation:** Contrast-Enhanced CT (CECT) of the abdomen. However, in children and pregnant women, Ultrasound (USG) is the initial investigation of choice.

Question 38: Which of the following is NOT a characteristic of acute appendicitis?

A. Anorexia
B. Rovsing's sign
C. Fever >42 degrees Celsius (Correct Answer)
D. Peri-umbilical colic

Explanation: **Explanation:** Acute appendicitis is a clinical diagnosis characterized by a predictable sequence of symptoms and physical signs. **Why Option C is the correct answer:** In acute appendicitis, a low-grade fever (typically 37.5°C to 38.5°C) is common. A **fever >42°C (hyperpyrexia)** is physiologically extreme and incompatible with simple inflammatory conditions like appendicitis. Such high temperatures are usually associated with heatstroke or hypothalamic damage. If a patient with appendicitis develops a very high fever (>39°C or 40°C), it typically suggests a complication like **perforation or generalized peritonitis**, but even then, it rarely reaches 42°C. **Analysis of Incorrect Options:** * **A. Anorexia:** Often called the "hamburger sign," anorexia is a classic feature. If a patient is hungry, the diagnosis of acute appendicitis should be questioned. * **B. Rovsing's sign:** This is a classic physical sign where palpation of the Left Lower Quadrant (LLQ) causes pain in the Right Lower Quadrant (RLQ) due to the displacement of gas and peritoneal irritation. * **D. Peri-umbilical colic:** This is the typical initial symptom. It occurs due to distension of the appendix, which sends visceral pain signals via the T10 sympathetic fibers to the periumbilical region. **High-Yield Clinical Pearls for NEET-PG:** * **Murphy’s Triad:** Pain first, followed by vomiting, and then fever (in that specific order). * **Kocher’s Point:** The shift of pain from the umbilicus to the RLQ (McBurney’s point). * **Alvarado Score (MANTRELS):** A score of $\geq$ 7 is highly suggestive of appendicitis. * **Most common position:** Retrocecal (75%), followed by Pelvic (20%). * **Gold standard investigation:** Contrast-Enhanced CT (CECT) abdomen.

Question 39: Which of the following is NOT a surgical indication in inflammatory bowel disease?

A. Obstruction
B. Perianal complication
C. Extraintestinal complication (Correct Answer)
D. Stricture

Explanation: ### Explanation In Inflammatory Bowel Disease (IBD), surgery is generally reserved for complications that cannot be managed medically. **Why "Extraintestinal Complications" is the correct answer:** Extraintestinal manifestations (EIMs) such as **erythema nodosum, peripheral arthritis, and episcleritis** usually parallel the activity of the bowel disease and improve with medical management of the primary inflammation. Others, like **Primary Sclerosing Cholangitis (PSC) and Ankylosing Spondylitis**, follow a course independent of the bowel disease. Therefore, surgical resection of the diseased bowel (especially in Crohn’s) does not reliably cure or improve these complications, making them a **non-indication** for surgery. **Analysis of Incorrect Options:** * **Obstruction (A):** This is the **most common indication** for surgery in Crohn’s disease, usually caused by fibrotic narrowing or acute inflammation. * **Perianal Complications (B):** Complex fistulae, recurrent abscesses, or symptomatic anal fissures that fail medical therapy (like Infliximab) require surgical intervention (e.g., Seton placement or diversion). * **Stricture (D):** Persistent symptomatic strictures, especially those causing "pre-stenotic dilatation" or those suspicious of malignancy, require surgical procedures like **Strictureplasty** (to preserve bowel length) or resection. **NEET-PG High-Yield Pearls:** 1. **Ulcerative Colitis (UC):** Surgery (Proctocolectomy) is **curative**. The most common emergency indication is **Toxic Megacolon** (refractory to 24–72 hours of medical therapy). 2. **Crohn’s Disease:** Surgery is **not curative** due to the transmural, skip-lesion nature. The goal is "bowel-preserving surgery" to avoid **Short Bowel Syndrome**. 3. **Cancer Risk:** Long-standing IBD (especially UC >10 years) increases the risk of colorectal cancer; high-grade dysplasia is a definitive surgical indication.

Question 40: What is the recommended distal clearance in surgical resection for carcinoma of the rectum?

A. 2 cm (Correct Answer)
B. 5 cm
C. 10 cm
D. 8 cm

Explanation: In rectal cancer surgery, the goal is to achieve an R0 resection (microscopically negative margins) while preserving as much sphincter function as possible. ### **1. Why 2 cm is the Correct Answer** The **distal margin** refers to the distance between the lower edge of the tumor and the line of transection. Historically, a 5 cm margin was mandated. However, pathological studies have shown that intramural (within the wall) spread of rectal cancer rarely exceeds 1–2 cm distally. * **Current Standard:** A **2 cm distal margin** is considered oncologically safe for most rectal cancers. * **Exception:** For low rectal cancers where a 2 cm margin would necessitate a permanent stoma (Abdominoperineal Resection), a **1 cm margin** is now acceptable, provided the tumor is not high-grade or poorly differentiated. ### **2. Why Other Options are Incorrect** * **5 cm (Option B):** This was the traditional "5 cm rule" based on older studies. It is now considered obsolete for the rectum as it leads to unnecessary sphincter sacrifice without improving survival. It remains the standard for **proximal** margins and for **colon** cancer. * **8 cm & 10 cm (Options C & D):** These margins are excessive and would result in total proctectomy for almost all patients, significantly increasing morbidity without any oncological benefit. ### **3. High-Yield Clinical Pearls for NEET-PG** * **Total Mesorectal Excision (TME):** This is the "Gold Standard" for middle and lower third rectal cancers. It involves removing the mesorectum (containing lymph nodes) intact. * **Radial/Circumferential Resection Margin (CRM):** This is the most important predictor of local recurrence. A margin of **>1 mm** is required. * **Proximal Margin:** Always remains **5 cm** to ensure clearance of the lymphatic drainage. * **Level of Ligation:** The Inferior Mesenteric Artery (IMA) is typically ligated at its origin from the aorta (**High Tie**) to ensure complete lymphadenectomy.

Practice by Chapter

Esophageal Disorders

Practice Questions

Gastric Disorders

Practice Questions

Small Intestine Pathology

Practice Questions

Appendicitis

Practice Questions

Inflammatory Bowel Disease

Practice Questions

Intestinal Obstruction

Practice Questions

Gastrointestinal Bleeding

Practice Questions

Diverticular Disease

Practice Questions

Anorectal Disorders

Practice Questions

Colorectal Neoplasms

Practice Questions

Gastrointestinal Stomas

Practice Questions

Bariatric Surgery Principles

Practice Questions

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